CN107226578A - One kind is used for offshore oilfield polymer-bearing waste-water reinjection treatment method - Google Patents

One kind is used for offshore oilfield polymer-bearing waste-water reinjection treatment method Download PDF

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Publication number
CN107226578A
CN107226578A CN201610170695.7A CN201610170695A CN107226578A CN 107226578 A CN107226578 A CN 107226578A CN 201610170695 A CN201610170695 A CN 201610170695A CN 107226578 A CN107226578 A CN 107226578A
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Prior art keywords
polymer
water
air
bearing waste
dissolving
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CN201610170695.7A
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Chinese (zh)
Inventor
刘建春
屈撑囤
李泓
鱼涛
刘咚
王洪福
张博
张喜华
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Samsung Energy Polytron Technologies Inc
Xian Shiyou University
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Samsung Energy Polytron Technologies Inc
Xian Shiyou University
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Priority to CN201610170695.7A priority Critical patent/CN107226578A/en
Publication of CN107226578A publication Critical patent/CN107226578A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities

Abstract

One kind is used for offshore oilfield polymer-bearing waste-water deep treatment method.Polymer-bearing waste-water first after electrical desalting and dewatering device enters oil removing settling pot, stands and enters sewage regulation tank after certain time;The gas being promoted to pump in dissolving, dissolving after tank water outlet adjustment pH is adjusted from sewage to be pumped into by air pump.Dissolving water outlet enters electrolytic oxidation-air-float integral processing unit, wherein, dissolving delivery port(Electrolytic oxidation-air-float integral processing unit import)Provided with sewage release head, air-water mixture exists in electrolytic acid cleaning oxydation process;Negative electrode, the anode of electrolytic oxidation apparatus are alternately arranged, and hairbrush can be moved up and down between the two by being provided with;Electrolytic oxidation-air-float integral processing unit water outlet enters surge tank, adds alkali and is neutralized to pH for after 7.5, re-injection after being filtered by filter.Polymer-bearing waste-water after being handled using the above method, more than the 500mg/L that polymer has before processing is reduced to below 50mg/L, and suspension content, oil content are reduced to 10.0, below 10.0mg/L by the 200 of before processing, 150mg/L respectively.

Description

One kind is used for offshore oilfield polymer-bearing waste-water reinjection treatment method
Technical field
The present invention relates to a kind of offshore oilfield polymer-bearing waste-water deep treatment method, belong to offshore oilfield polymer-bearing waste-water processing skill Art field.
Background technology
Oil extraction-generated waste water is to be extracted with crude oil, formed by the initial gross separation process such as crude oil demulsification from stratum A kind of heterogeneous system for integrating suspended solid, oil, dissolved gas and dissolving salt.Technology development includes gravitational settling Handling process, air-flotation process technique, biochemistry treatment technology, membrane technology etc..The treatment effect and sewage of these methods In oil content, suspension content, organic matter composition etc. it is in close relations.During polymer-contained sewage, because this kind of sewage viscosity compared with High, flco growth and sedimentation difficulty two are difficult to reach processing standard.
Polymer flooding is a kind of method for improving recovery ratio, and macroscopically, it reduces displacing fluid mainly by increase displacement fluid viscosity With the mobility ratio of driven liquid, so as to expand swept volume;On microcosmic, polymer is due to its intrinsic viscoplasticity, in flowing During produce stretching action to oil film or oil droplet, add carrying power, improve microcosmic displacement efficiency.Used in polymer flooding Polymer has heatproof, salt tolerant, anti-shearing characteristic, is that the class with a small amount of hydrophobic grouping is water-soluble on large hydrophilic molecular chain Polymer.Automatically generated due to hydrophobic effect and electrostatic, the effect of hydrogen bond or Van der Waals force of hydrophobic grouping intermolecular With some strength but reversible physical association, so as to form huge 3 D stereo mesh space structure.By increasing water Phase viscosity improves mobility ratio with reduction water phase permeability, sweep efficiency is improved, so as to improve oil production rate.Polymer flooding Afterwards, polymer of the meeting containing higher concentration in Produced Liquid particularly recovered water, makes its viscosity reach more than 20mpa.s.By its Produced-water reinjection standard is handled, is the main whereabouts after such sewage disposal.
CN1381410A is related to polymer-bearing waste-water advanced treating and reuse technology, and the processing unit of use has dosing, resin adsorption, two Level membrane filtration.Offshore oilfield polymer-bearing waste-water viscosity is high, sewage composition is complicated, and flux depression is too fast and backwash is difficult, and industry should With there is the rare problem of long-period stable operation, it is not suitable for offshore oilfield application.
CN101786772A is related to polymer-containing sewage in oil field efficient biological treatment method, using air supporting, Anaerobic Treatment-Aerobic Process for Treatment, The techniques such as filtering, secondary precipitation are handled polymer-bearing waste-water, and the wherein Anaerobic Treatment time is 24-36h, and Aerobic Process for Treatment is 10- 14h, processing time is long, and treatment effeciency is relatively low, is not suitable for offshore oilfield application.
CN101803562A is related to a kind of method of high-gradient agglomerated air floatation polymer-contained sewage, and one-level coalescence, two are carried out successively Level high-gradient agglomerated air floatation, three-level water-oil separating processing.Processing unit is more, floor space is big, is not suitable for offshore oilfield application.
The content of the invention
It is an object of the invention to overcome, current polymer-bearing waste-water treatment effeciency is relatively low, it is poly- to be not suitable for containing for offshore oilfield application Sewage water treatment method is a kind of for offshore oilfield polymer-bearing waste-water deep treatment method.Comprise the steps of:
One kind is used for offshore oilfield polymer-bearing waste-water deep treatment method.Comprise the steps of:
(1)Polymer-bearing waste-water after electrical desalting and dewatering device enters oil removing settling pot, stands and enters sewage regulation after certain time Tank;
(2)The gas being promoted to pump in dissolving, dissolving after tank water outlet adjustment pH is adjusted from sewage to be pumped into by air pump.
(3)Dissolving water outlet enters electrolytic oxidation-air-float integral processing unit, wherein, dissolving delivery port(It is electrolysed oxygen Change-air-float integral processing unit import)Provided with sewage release head, air-water mixture exists in electrolytic acid cleaning oxydation process;
(4)Negative electrode, the anode of electrolytic oxidation apparatus are alternately arranged, and hairbrush can be moved up and down between the two by being provided with;
(5)Electrolytic oxidation-air-float integral processing unit water outlet enters surge tank, adds alkali and is neutralized to pH after 7.5, to pass through Re-injection after filter filtering.
Time of repose of the sewage in oil removing settling pot be 10-20h after, using acid(Can be:Inorganic acid, organic acid.It is wherein inorganic Acid has hydrochloric acid, sulfuric acid, nitric acid;Organic acid has chlorosulfonic acid, benzene sulfonic acid, acetic acid)Adjust after sewage pH is 3-5, it is molten into dissolving The medium that gas tank is added can be air, air-ozone, air-hydrogen peroxide, and dissolving water outlet enters electrolytic oxidation-air supporting one Body processing unit, wherein, dissolving delivery port(Electrolytic oxidation-air-float integral processing unit import)Provided with sewage release Head, air-water mixture exists in electrolytic acid cleaning oxydation process;Electrolytic oxidation-air-float integral processing unit water outlet enters surge tank, Add alkali(Ammoniacal liquor, sodium hydroxide or sodium hydroxide-calcium oxide)PH is neutralized to for after 7.5, by conventional modified fiber ball- Double-filter material filter is used in series re-injection after filtering.
Plate material used is:Anode:Iron plate electrode, boron-doped diamond (BDD) electrode, iron plating lead dioxide electrode, iron plating Ruthenic oxide electrode, stannic oxide electrode etc..Negative electrode:Stainless steel electrode, graphite electrode.Being provided between the two to move up and down Hairbrush, pole plate spacing can be 3-5cm, and hairbrush diameter is identical with pole plate spacing.The current strength of electrolytic process can be 0.5-5A, place The reason time is 5-30min.
Polymer-bearing waste-water after being handled using the above method, more than the 500mg/L that polymer has before processing is reduced to below 50mg/L, Suspension content, oil content are reduced to 10.0, below 10.0mg/L by the 200 of before processing, 150mg/L respectively.
Accompanying drawing is process chart.
Embodiment 1
After time of repose of the sewage in oil removing settling pot is after 10h, uses sulfuric acid regulation sewage pH for 3, into dissolving, The medium that dissolving is added can be air-ozone, and wherein ozone concentration is the 2% of gaseous mixture.Dissolving water outlet enters electrolysis oxygen The sewage release head of change-air-float integral processing unit, air-water mixture is that 0.5A, voltage are electrolysis under the conditions of 30V in electric current Aoxidize and enter surge tank after 5min, add 5% sodium hydroxide and be neutralized to pH after 7.5, to pass through conventional modified fiber ball-double filtering Filter is used in series re-injection after filtering.
Plate material used is:Anode is iron plate electrode, and negative electrode is stainless steel electrode, and pole plate spacing can be 5cm, hairbrush diameter It is identical with pole plate spacing.
Embodiment 2
It is molten into dissolving after time of repose of the sewage in oil removing settling pot is after 15h, uses hydrochloric acid regulation sewage pH for 4 The medium that gas tank is added can be air-hydrogen peroxide, and wherein hydrogen peroxide concentration is 50mg/L.Dissolving water outlet enters electrolysis oxygen The sewage release head of change-air-float integral processing unit, air-water mixture is that 2A, voltage are to be electrolysed oxygen under the conditions of 30V in electric current Change and enter surge tank after 15min, add 5% sodium hydroxide-quick lime(Both mass ratioes are 20:1)PH is neutralized to for after 7.5, Re-injection after filtering is used in series by conventional modified fiber ball-Double-filter material filter.
Plate material used is:Anode boron-doped diamond (BDD) electrode, negative electrode is graphite electrode, and pole plate spacing can be 3cm, Hairbrush diameter is identical with pole plate spacing.
Embodiment 3
After time of repose of the sewage in oil removing settling pot is after 20h, uses hydrochloric acid regulation sewage pH for 5, into dissolving, The medium that dissolving is added can be air.Dissolving water outlet enters after electrolytic oxidation-air-float integral processing unit, and air water is mixed Compound is that 2A, voltage are to enter surge tank after electrolytic oxidation 20min under the conditions of 20V in electric current, adds 5% ammonia spirit and is neutralized to PH be 7.0 after, by conventional modified fiber ball-Double-filter material filter be used in series filtering after re-injection.
Plate material used is:Anode iron plates ruthenic oxide electrode, and negative electrode is stainless steel electrode, and pole plate spacing can be 3cm, hair Brush diameter is identical with pole plate spacing.
Embodiment 4
After time of repose of the sewage in oil removing settling pot is after 10h, uses hydrochloric acid regulation sewage pH for 5, into dissolving, The medium that dissolving is added can be air-ozone, and wherein ozone concentration is the 3% of gaseous mixture.Dissolving water outlet enters electrolysis oxygen After change-air-float integral processing unit, air-water mixture is that 3A, voltage are under the conditions of 20V after electrolytic oxidation 10min in electric current Into surge tank, 5% sodium hydroxide-quick lime is added(Both mass ratioes are 20:1)PH is neutralized to after 7.0, by conventional to change Property fibrous nodules-Double-filter material filter be used in series filtering after re-injection.
Plate material used is:Anode iron plates lead dioxide electrode, and negative electrode is graphite electrode, and pole plate spacing can be 5cm, hairbrush Diameter is identical with pole plate spacing.
Embodiment 5
After time of repose of the sewage in oil removing settling pot is after 10h, uses chlorosulfonic acid regulation sewage pH for 5, into molten gas Tank, the medium that dissolving is added can be air-ozone, and wherein ozone concentration is the 3% of gaseous mixture.Dissolving water outlet enters electrolysis After oxidation-air-float integral processing unit, air-water mixture is that 3A, voltage are electrolytic oxidation 10min under the conditions of 20V in electric current Enter surge tank afterwards, add 5% sodium hydroxide-quick lime(Both mass ratioes are 20:1)PH is neutralized to after 7.0, to pass through routine Modified fiber ball-Double-filter material filter is used in series re-injection after filtering.
Plate material used is:Anode stannic oxide electrode, negative electrode is stainless steel electrode, and pole plate spacing can be 5cm, and hairbrush is straight Footpath is identical with pole plate spacing.
Embodiment 6
After time of repose of the sewage in oil removing settling pot is after 10h, uses chlorosulfonic acid regulation sewage pH for 4, into molten gas Tank, the medium that dissolving is added can be air.Dissolving water outlet enters after electrolytic oxidation-air-float integral processing unit, air water Mixture is that 5A, voltage are to enter surge tank after electrolytic oxidation 30min under the conditions of 20V in electric current, adds 5% sodium hydroxide and neutralizes To pH be 7.0 after, by conventional modified fiber ball-Double-filter material filter be used in series filtering after re-injection.
Plate material used is:Anode iron plates lead dioxide electrode, and negative electrode is stainless steel electrode, and pole plate spacing can be 3cm, Hairbrush diameter is identical with pole plate spacing.
Embodiment 7
After time of repose of the sewage in oil removing settling pot is after 20h, uses acetic acid regulation sewage pH for 5, into dissolving, The medium that dissolving is added can be air-hydrogen peroxide, and hydrogen peroxide concentration is 80mg/L.Dissolving water outlet enter electrolytic oxidation- After air-float integral processing unit, air-water mixture is that 4A, voltage are to enter after electrolytic oxidation 20min under the conditions of 30V in electric current Surge tank, adds 5% ammoniacal liquor and is neutralized to pH after 7.5, filtering is used in series by conventional modified fiber ball-Double-filter material filter Re-injection afterwards.
Plate material used is:Anode iron plate electrode, negative electrode is graphite electrode, and pole plate spacing can be 4cm, hairbrush diameter and pole Plate spacing is identical.
Offshore oilfield polymer-bearing waste-water is handled using the above method, effect before and after the processing see the table below.
The Contrast on effect of offshore oilfield polymer-bearing waste-water before and after the processing(Unit:mg/L)

Claims (10)

1. one kind is used for offshore oilfield polymer-bearing waste-water reinjection treatment method, comprise the steps of:
(1)Polymer-bearing waste-water after electrical desalting and dewatering device enters oil removing settling pot, stands and enters sewage regulation after certain time Tank;
(2)The gas being promoted to pump in dissolving, dissolving after tank water outlet adjustment pH is adjusted from sewage to be pumped into by air pump.
(3)Dissolving water outlet enters electrolytic oxidation-air-float integral processing unit, wherein, dissolving delivery port(It is electrolysed oxygen Change-air-float integral processing unit import)Provided with sewage release head, air-water mixture exists in electrolytic acid cleaning oxydation process;
(4)Negative electrode, the anode of electrolytic oxidation apparatus are alternately arranged, and hairbrush can be moved up and down between the two by being provided with;
(5)Electrolytic oxidation-air-float integral processing unit water outlet enters surge tank, adds alkali and is neutralized to pH after 7.5, to pass through Re-injection after filter filtering.
2. the polymer-bearing waste-water deep treatment method according to claims 1, time of repose of the sewage in oil removing settling pot For 10-20h.
3. the polymer-bearing waste-water deep treatment method according to claims 1, regulation sewage pH is 3-5.
4. the polymer-bearing waste-water deep treatment method according to claims 1, the acid used can be for:Inorganic acid, organic acid.Its Middle inorganic acid has hydrochloric acid, sulfuric acid, nitric acid;Organic acid has chlorosulfonic acid, benzene sulfonic acid, acetic acid.
5. the polymer-bearing waste-water deep treatment method according to claims 1, dirty underwater bubble is between 20-50 μm.
6. the polymer-bearing waste-water deep treatment method according to claims 1, plate material is:Anode:Iron plate electrode, boron-doping Diamond (BDD) electrode, iron plating lead dioxide electrode, iron plating ruthenic oxide electrode, stannic oxide electrode etc..Negative electrode:Stainless steel Electrode, graphite electrode.Hairbrush can be moved up and down by being provided between the two, and pole plate spacing can be 3-5cm, between hairbrush diameter and pole plate Away from identical.
7. the polymer-bearing waste-water deep treatment method according to claims 1, the current strength of electrolytic process can be 0.5-5A, Processing time is 5-30min.
8. the polymer-bearing waste-water deep treatment method according to claims 1, gas can be air, air-ozone, sky Gas-hydrogen peroxide.
9. the polymer-bearing waste-water deep treatment method according to claims 1, addition alkali is ammoniacal liquor, sodium hydroxide or hydrogen-oxygen Change sodium-calcium oxide.
10. the polymer-bearing waste-water deep treatment method according to claims 1, filter is conventional modified fiber ball-bis- filters Material filter is used in series.
CN201610170695.7A 2016-03-24 2016-03-24 One kind is used for offshore oilfield polymer-bearing waste-water reinjection treatment method Pending CN107226578A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107840495A (en) * 2017-11-01 2018-03-27 中国石油天然气集团公司 A kind of processing method of crude oil electric desalting waste water
CN108238689A (en) * 2018-01-16 2018-07-03 航天凯天环保科技股份有限公司 A kind of processing method of polymer flooding oily water
CN110642435A (en) * 2019-09-27 2020-01-03 北京帝力伟业科技开发有限公司 Clean treatment system and method for ASP flooding oil extraction wastewater

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Publication number Priority date Publication date Assignee Title
CN107840495A (en) * 2017-11-01 2018-03-27 中国石油天然气集团公司 A kind of processing method of crude oil electric desalting waste water
CN108238689A (en) * 2018-01-16 2018-07-03 航天凯天环保科技股份有限公司 A kind of processing method of polymer flooding oily water
CN110642435A (en) * 2019-09-27 2020-01-03 北京帝力伟业科技开发有限公司 Clean treatment system and method for ASP flooding oil extraction wastewater

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